Optimization design of absorption performance for variant Poisson's ratio honeycomb sandwich structure
The absorption performance analysis of honeycomb sandwich structures with variant Poisson's ratio and optimization design of honeycomb configuration with given reflectivity were carried out,by classifying of hexa-gonal honeycomb configurations using Poisson's ratio and establishing a parameterized finite element model of hon-eycomb cells based on homogenization theory.The results show that under the condition of 2～18 GHz electromagnet-ic wave normal incidence,reducing the length and increasing the height of the honeycomb can effectively improve the absorption performance.The change of angle that causes the Poisson's ratio to approach zero can improve the absorption performance,and there is an optimal coating thickness that matches the geometric parameters of the hon-eycomb to obtain the optimal absorption performance.Compared to the initial schemes of regular hexagonal honey-comb with positive Poisson's ratio,semi-re-entrant hexagonal honeycomb with zero Poisson's ratio,and re-entrant hexagonal honeycomb with negative Poisson's ratio,the absorption bandwidth of the three optimized honey-comb designs with reflectivity of-10 dB increased by 56.8%,35.2%,and 52.5%,respectively,while the ab-sorption bandwidth of the three optimized honeycomb designs with reflectivity of-20 dB increased from zero to 4 GHz,2.3 GHz and 0.5 GHz,respectively.Among the three types of Poisson's ratio honeycomb,the positive Pois-son's ratio honeycomb has the best optimization adaptability potential.The research results provide a reference for the honeycomb configuration design of multifunctional honeycomb absorbing structures.
万方数据
维普
